Mare Crisium is that interesting isolated sea on the northeastern side of the visible lunar surface. Not long before beginning the sketch, it became fully illuminated.
The Nectarian Period impact event that formed this feature occurred more than 3.8 billion years ago. The mare portion of the basin is about 500 kilometers across. In the grazing sunlight on the floor, wrinkled ridges were visible. Also on the western floor craters Picard (24 km.), Peirce (19 km.) and Swift (11km.) stood out in the low light. I could see the lighter gray bench lava that partly buried craters here such as Yerkes (37 km.). Tall flat top mountains (massifs) beyond the shore stand at 2-5 kilometers above the sea. Both promontoria Lavinium and Olivium stood out clearly in very brief moments.

Thank you for all the nice words.--Alex - You certainly are correct about the over doing it while sketching, I have ruined my share by over working some.--Mike, and Peter - Don't think for one minute that you can't do this lunar sketching or any kind of sketching. What helps more than anything is free time to practice.

Great sketch Frank,Is that Yerkes the corrupt Chicago transportation tycoon that got a crater on the moon named after him just because he financed an observatory? Maybe we should offer the same deal to Gates or some other uber rich person, imagine the boom in observatories being bulit. lol.